US1995164A - Oscillation generation - Google Patents

Oscillation generation Download PDF

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Publication number
US1995164A
US1995164A US694225A US69422533A US1995164A US 1995164 A US1995164 A US 1995164A US 694225 A US694225 A US 694225A US 69422533 A US69422533 A US 69422533A US 1995164 A US1995164 A US 1995164A
Authority
US
United States
Prior art keywords
cathode
grid
tuned
anode
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US694225A
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English (en)
Inventor
James N Whitaker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Priority to US694225A priority Critical patent/US1995164A/en
Priority to FR778976D priority patent/FR778976A/fr
Priority to FR779104D priority patent/FR779104A/fr
Application granted granted Critical
Publication of US1995164A publication Critical patent/US1995164A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
    • H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
    • H03B5/34—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being vacuum tube
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B7/00—Generation of oscillations using active element having a negative resistance between two of its electrodes
    • H03B7/02—Generation of oscillations using active element having a negative resistance between two of its electrodes with frequency-determining element comprising lumped inductance and capacitance
    • H03B7/04—Generation of oscillations using active element having a negative resistance between two of its electrodes with frequency-determining element comprising lumped inductance and capacitance active element being vacuum tube

Definitions

  • the fundamental frequency controlling element of the system shown in the drawing is a piezo-electric crystal 2 which is connected between the cathode 4 and the first grid, control, or cold electrode 6 adjacent the cathode.
  • a choke coil 8 in series with the grid leak condenser arrangement 10 is also connected between the grid 6 and cathode 4.
  • the second and third grid electrodes 12, 14 are the second and third grid electrodes 12, 14
  • the grid electrode 12 would normally be the screen grid and may be termed an intermediate grid.
  • the grid 14 would normally be the suppressor grid of the tube 10 and would normally be adjacent the anode 20 of tube 10.
  • a second tunable circuit 22 tween the anode or plate 20 and the cathode there is connected a second tunable circuit 22.
  • the lower ends of the tuned circuits 18, 22 are connected to ground for high frequency currents by the action of by-passing condensers 24, 26.
  • Plate 20 is maintained through lead 28 at a lower positive potential with respect to the cathode 4 than the combined electrodes 12, 14 which are maintained at a higher positive potential with respect to the cathode by the application of 2. voltagefrom potentiometer 30 through lead 32.
  • Oscillations are set up in the tuned circuit- 18 by virtue of regenerative action, feedback occurring through the interelectrode capacity exist ing between the grid 6 and the grids 12, 14.
  • Oscillations at the same or preferably a harmonic frequency or sub-harmonic frequency are set up in circuit 22 by virtue of negative resistance or dynatron action as described more fully in my copending application already referred to. I have found, by connecting the grids 12, 14 together, that there is a substantial increase in power at the harmonic frequencies circuit 22, which of course should be tuned to the desired harmonic of circuit 18 .or to the fundamental frequency of the crystal 2. Moreover, if desired, circuit 22 may be tuned to the same frequencyas the crystal 2 or to some sub-harmonic.
  • circuit 18 may be tuned to the same, toa multiple, or to 7 some sub-multiple of the controlling frequency, and similarly circuit 22 may be tuned to the same frequency as the controlling frequency applied to points X or to some harmonic thereof, or to some sub-harmonic thereof, it being understood further that circuits 18 and 22 may be tuned simul taneously to the same or different frequencies.
  • An oscillation generating system comprising a tube having an anode electrode, a grid adjacent the anode, a cathode electrode, a grid adjacent the cathode and a grid intermediate said 2 the. grid adjacent the cathode and the cathode, short circuiting means connecting directly together the intermediate grid and the grid adjacent the anode, an oscillatory circuit connected between the grids connected together and said cathode, and an oscillatory circuit connected between said anode and cathode.
  • An oscillation generator comprising a vacuum tube having an anode, a cathode, a control grid, 2. screen grid and a suppressor grid, a piezo-electric crystal connected between the control grid and cathode, means short circuiting to gether said screen grid and said suppressor grid, a tuned circuit connected between the grids connected together and said cathode, a tuned circuit connected between said anode and cathode, means for maintaining said anode at a positive potential with respect to said cathode, and means for maintaining suppressor and screen grids at a higher positive potential with respect to said cathode.
  • Apparatus as claimed in the preceding claim characterized by the fact that the circuit connected between said anode and cathode is tuned to a harmonic of the operating frequency of said piezo-electric crystal.

Landscapes

  • Oscillators With Electromechanical Resonators (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
US694225A 1933-10-19 1933-10-19 Oscillation generation Expired - Lifetime US1995164A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US694225A US1995164A (en) 1933-10-19 1933-10-19 Oscillation generation
FR778976D FR778976A (fr) 1933-10-19 1934-09-28 Perfectionnements aux générateurs d'oscillations
FR779104D FR779104A (fr) 1933-10-19 1934-09-29 Perfectionnements aux générateurs d'oscillations

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US694225A US1995164A (en) 1933-10-19 1933-10-19 Oscillation generation

Publications (1)

Publication Number Publication Date
US1995164A true US1995164A (en) 1935-03-19

Family

ID=24787927

Family Applications (1)

Application Number Title Priority Date Filing Date
US694225A Expired - Lifetime US1995164A (en) 1933-10-19 1933-10-19 Oscillation generation

Country Status (2)

Country Link
US (1) US1995164A (fr)
FR (2) FR778976A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2510111A (en) * 1948-02-26 1950-06-06 Conrad H Hoeppner Frequency modulation of negative transconductance oscillators

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2510111A (en) * 1948-02-26 1950-06-06 Conrad H Hoeppner Frequency modulation of negative transconductance oscillators

Also Published As

Publication number Publication date
FR779104A (fr) 1935-03-29
FR778976A (fr) 1935-03-27

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